Hi there guys, well im new on Oakley stuff, doesnt matter that i have 8 years with my sunglasses but im trying to get a replacement lenses and sometimes on the internet says X-Metal XX, and XX just alone. Here is a picture of my Oakley. Also is there any way to decode the serial #? mine is XX045448 This are the lens Oakley X METAL XX REPLACEMENT LENSES - Purchase Oakley eyewear from the online Oakley store and Oakley XX Replacement Lenses available online at Oakley.com Im confuse. Sorry for a noob question.